Since cache isn't freed in sysdeps/unix/sysv/linux/check_pf.c,

"make xcheck" reports:

[hjl@gnu-6 build-x86_64-linux]$ cat posix/bug-ga2-mem 

Memory not freed:
-----------------
           Address     Size     Caller
0x00005555557791e0     0x78  at 0x7ffff7d5d989
[hjl@gnu-6 build-x86_64-linux]$ 

We should add

/* Make sure cache is freed before exiting.  */
libc_freeres_fn (freecache)
{
  if (cache)
    free (cache);
}

or

/* Make sure cache is freed before exiting.  */
libc_freeres_fn (freecache)
{
  free (cache);
}